EP1248078A3 - Optical absolute encoder - Google Patents

Optical absolute encoder Download PDF

Info

Publication number
EP1248078A3
EP1248078A3 EP02007282A EP02007282A EP1248078A3 EP 1248078 A3 EP1248078 A3 EP 1248078A3 EP 02007282 A EP02007282 A EP 02007282A EP 02007282 A EP02007282 A EP 02007282A EP 1248078 A3 EP1248078 A3 EP 1248078A3
Authority
EP
European Patent Office
Prior art keywords
encoder
absolute encoder
read
light source
relates
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02007282A
Other languages
German (de)
French (fr)
Other versions
EP1248078A2 (en
Inventor
Kaoru c/o Kabushiki Kaisha Topcon Kumagai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Topcon Corp
Original Assignee
Topcon Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Topcon Corp filed Critical Topcon Corp
Publication of EP1248078A2 publication Critical patent/EP1248078A2/en
Publication of EP1248078A3 publication Critical patent/EP1248078A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/249—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using pulse code
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/347—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
    • G01D5/34707—Scales; Discs, e.g. fixation, fabrication, compensation
    • G01D5/34715—Scale reading or illumination devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/36—Forming the light into pulses

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Transform (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The present invention relates to a rotary encoder for detecting an angle, and more particularly to an absolute encoder which can read a pattern even when rotating at high speed. The present invention also relates to an encoder reading device that projects a pattern formed on an encoder onto a light receiving means using light emitted from a light source means so as to read a position of the encoder. The light source means is configured to emit a pulse that is synchronized with a shift pulse for moving an electric charge to a transfer gate of the light receiving means, and that is sufficiently shorter than a time interval (accumulation time) of the shift pulse.
EP02007282A 2001-04-03 2002-04-02 Optical absolute encoder Withdrawn EP1248078A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001105202 2001-04-03
JP2001105202A JP2002303538A (en) 2001-04-03 2001-04-03 Encoder reading device

Publications (2)

Publication Number Publication Date
EP1248078A2 EP1248078A2 (en) 2002-10-09
EP1248078A3 true EP1248078A3 (en) 2005-05-04

Family

ID=18957927

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02007282A Withdrawn EP1248078A3 (en) 2001-04-03 2002-04-02 Optical absolute encoder

Country Status (3)

Country Link
US (1) US6677863B2 (en)
EP (1) EP1248078A3 (en)
JP (1) JP2002303538A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014102121A (en) 2012-11-19 2014-06-05 Canon Inc Optical encoder
JP2019143979A (en) * 2018-02-15 2019-08-29 セイコーエプソン株式会社 Encoder unit, angle detection method, and robot

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3116886A (en) * 1960-08-02 1964-01-07 Keuffel & Esser Co Photosensitive electro-optical micrometers for rotary axles
US4291976A (en) * 1980-03-10 1981-09-29 Sperry Corporation Digital fiber optic position sensor
DE4138298A1 (en) * 1990-11-21 1992-06-04 Nippon Denso Co METHOD AND DEVICE FOR THE CONTACT-FREE MEASUREMENT OF A MOTION SIZE
US5302944A (en) * 1991-07-22 1994-04-12 Curtis Stephen J Method and apparatus for the monitoring of the operation of linear and rotary encoders
US5744795A (en) * 1995-07-31 1998-04-28 Hewlett-Packard Company Illumination strobing in a scanner to improve image sharpness and power consumption

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5567608A (en) * 1978-11-17 1980-05-21 Nippon Kogaku Kk <Nikon> Measurement unit for rotary angle
JPS57106818A (en) * 1980-12-24 1982-07-02 Fujitsu Ltd Position detector
DE3914557A1 (en) * 1989-05-03 1990-11-08 Heidenhain Gmbh Dr Johannes POSITION MEASURING DEVICE WITH SEVERAL SENSING POINTS
JPH05326919A (en) * 1992-05-25 1993-12-10 Toshiba Corp Image reading apparatus
US6483104B1 (en) * 1996-09-23 2002-11-19 Valeo Schalter Und Sensoren Gmbh Rotational angle sensor using a CCD line with enhanced measuring precision

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3116886A (en) * 1960-08-02 1964-01-07 Keuffel & Esser Co Photosensitive electro-optical micrometers for rotary axles
US4291976A (en) * 1980-03-10 1981-09-29 Sperry Corporation Digital fiber optic position sensor
DE4138298A1 (en) * 1990-11-21 1992-06-04 Nippon Denso Co METHOD AND DEVICE FOR THE CONTACT-FREE MEASUREMENT OF A MOTION SIZE
US5302944A (en) * 1991-07-22 1994-04-12 Curtis Stephen J Method and apparatus for the monitoring of the operation of linear and rotary encoders
US5744795A (en) * 1995-07-31 1998-04-28 Hewlett-Packard Company Illumination strobing in a scanner to improve image sharpness and power consumption

Also Published As

Publication number Publication date
US6677863B2 (en) 2004-01-13
US20020140580A1 (en) 2002-10-03
JP2002303538A (en) 2002-10-18
EP1248078A2 (en) 2002-10-09

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